Coating or plastic



IVUI UVIIII vvl l lvluv,

7 9 i t g comma OR PLASTIC.

wees neierence ENT' FREDERICK w. SOHROEDER, on NEW YORK, N. Y., ASSIG on or ONE-HALF 'ro FERDINAND W. ROEBLING, or TRENTON, NEW JERSEY.

INSULATING COMPOSITION R COMPOUND FOR COATING ELECTRIC AND OTHER WIRES 0R CONDUCTORS.

SPECIFICATION forming part of Letters Patent No. 251,473, dated December 27, 1881,

Application filedOctoberm, 1881. (No specimens.) 0";

To all whom it may concern.-

Be itknown that I, FREDERICK W. SCHROE- DER, of the city of New York, in the county and State of New York, have invented anew I and useful Insulating Composition or Compound for Coating Electric and other Wires or Conductors, which invention is fully set forth in, the following specification.

The object of this invention is to provide [O the conducting wires, rods, or cables for telegraphs, telephones, electric lights, and allsiniilar purposes with a coating that shall be fire- V proof, weather-proof, water-proof, and invulnerable to acids, as well as an efficient insulator or non-conductor of electricity.

Following are enumerated certain ingredi. cnts used in the manufacture of this composition, their manipulation and method of treatment being also fully set forth, namely: glue, :0 gnm-mastic,-dextrine, asbestus, chrome-alum, chloride of iron,albumen, and glycerinc. Said ingredients, in about the several proportions below mentioned, are treated as follows: Two pounds of lue preferably of the best quality, 2 5 are first dis sflved in one pound and a half of warm water in a suitable vessel set in a water at ea e not above the boiling-point. Then sixteen ounces of uni-mastic are dissolved in thirty-two" ounces 0 o and fourteen 0 ounces of dextrine in we] your ounces of asibgstus, well ground, in sixteen ounces of cerlne and two and one-half ounces of cliro' me-alum dissolved in eight ounces of glyce-mixture constituted as a ove erine, o

escri ed is next added one-fourth of an ounce 0 of hloride firon dissolved in fourteen ounces of water. %rom' eight to twenty ounces of albumen incorporated with from two to eig ounces of lvcerine should then be added to the mixture, l e composition is intended to 5 be exposed to the atmosphere or to salt-water.

If not, the albumen may be omitted, and, if desired, theasbestus also may be omitted where no danger of fire exists. Such acorn position is set forth in the specification in another applicacarefully stirred until all the ingredi nts are thoroughly incorporated, care being taken that the mixture shall not boil or reach its normal temperature of ebullition at atmospheric'pressure. The alcohol and water are used merely 5 5 as menstrua or vehicles for the solids dissolved therein and being evaporated or driven oft in the process or treatment. Any suitable solvents may be substituted therefor. The composition may be kept for anindefinite time in a melted or plastic state, but must not be allowed to set by cooling.

bile ii its warm plastic condition the comr efilfi mjmfiem [dibeicoated,macliihery of suitable character 6 5 b ng dforthis urpose. b hich thee-Oating as applied is subjected to -great pressure.

The composition, made and applied as above described, forms a thoroughly-insulating coat, impervious to the atmosphere and to either salt or freshwater. It is iuvulnerable to the attacks of acids, and of so refractory a nature that wire coated with it may be fused within its coat and the coat will remain as a hollow This coating will therefore prevent the cost of renewal and the greater annoyance of delaye'd use caused by the destruction by fire of telegraph and telephone wires not thus protected within buildings, within which fires,do- 8o ing but little injury to the buildings, frequently destroy or sever all the conducting-wires. 0onductors coated with this composition mayalso be laid in the earth with no other protection, the composition being indestructible either above or below ground, except by cutting or abrading forces.

Lightning-conductors used to protect highlycombustible materials-such as petroleum, usually stored in large quantities-may be 0 thoroughly insulated by a coating of this composition, the gases arising from the oil having no destructive efiect upon the coating, and its perfect insulatingqualities preveu ting ignition of said gases from the electrified condition of 9 5 the lightning-conductors.

In place of the asbestus, ilicate f side. or waterlass maybe substiiu't'ell, and in place of Eli 50 tion herewith filed. The whole mixtureis then tube, uninjured by the heat of the fused metal. 7 5

c mastic either gum-magic or the um f thg cherry-tree may e su Sl ed; anfad y 106 sujlflhlfiflfigl itggqgkgiggzmatter may be 1 ing or covering electric and other wires or con added, if esu'e 0 e ingredients above doctors, consisting of glue, mastic, dextrine, mentioned. asbestus, chrome-alum, chloride of iron, and I do not confine myself to the precise qnangiycerine, said ingredients being proportioned 5 tities or proportions of the materials herein and-treated either with or without the addinoted. as the proportions may be varied. The tionof albumen substantially as and for the quantities noted are, however, those which ex purposes set forth. perience has determined to be attended with FREDERICK WILLIAM SCHROEDER. the most satisfactory results. Witnesses: 1o As of my invention, I claim- D. H. KENAGA,

A refractory insnlat ingcomposition forcoat- G. A. CLEMENT. 

